1. With respect to a signal, to divert a portion of it, or divide it, into usually predetermined or specified proportions. 2. In INFOSEC, a secret random number that is a component of the final working key. [After X9.69] 3. An action that creates a private communication between the served user and a conferee. The private communication is a normal "two-party" call. [T1.647-1995]